Piscine;5081072; said:Yes, draining while adding new water is inherently draining some of the new water as well as the old....That makes the water change percentage less and, if you are testing water & changing it because of nitrates, causes more work for you with less benefit.
thats odd i have never had my nitrates over 20ppm and i have been doing changes like that for 5 years . i clean the gravel in the tank once a week,and let the water fill from the sink while my gravel cleaner just drains water. 15 minutes then i shut it all down.. my cichlids have grown almost 3" in 2 months .. when i am done i blast some prime in the tank and chill
